the taliban have claimed responsibility for the attack, describing it as one of their biggest successes ever, but some doubt the insurgents are behind it. sources told cbs news that the motive for the killing may have been a personal dispute. mandy clark, cbs news, kandahar. >> pelley: a city is giving police officers pink slips the same day they graduate from the academy. the commander in chief gives a hero the nation's highest military honor. and, presidents and first ladies come out to say goodbye to betty ford. when "the cbs evening news" continues. with an irregular heartbeat called atrial fibrillation, or afib, that's not caused by a heart valve problem. today we have pradaxa to reduce the risk of a stroke caused by a clot. in a clinical trial, pradaxa 150 mg reduced stroke risk 35% more than warfarin. and with pradaxa, there's no need for those regular blood tests. pradaxa is progress. pradaxa can cause serious, sometimes fatal, bleeding. don't take pradaxa if you have abnormal bleeding, and seek immediate medical care for unexpected signs of bleeding, like unusual bruising. prad